Canadian Boating Practice Exam

Question: 1 / 400

What sound signal does a power vessel underway but not moving make?

One prolonged blast every minute

Two prolonged blasts every two minutes

A power vessel underway but not moving does not create any sound signal, so answering A and D are incorrect. A ship underway and not moving is considered a "stopped" vessel, and should produce two blasts every two minutes to indicate that it is not underway as required by the International Regulations for Preventing Collisions at Sea (COLREGS). Answering C is incorrect because three short blasts every two minutes is a sound signal used by a vessel backing up or turning around. Thus, B is the correct option as it accurately describes the sound signal used by a power vessel underway but not moving.

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Three short blasts every two minutes

Continuous sounding

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